I am using a VPS as a public proxy, and I have begun to realize that I must make my VPS more secure as I have seen in Securing Public Shadowsocks Server. Shadowsocks is a fast tunnel proxy that helps ...

I have Lubuntu 14.04 LTS with vsftpd and the lamp stack (apache2, etc.) installed. Everything works fine on the LAN. Externally, the services don't acknowledge connection attempts. I can see packets ...

First of all I am new to Ubuntu server. I am still trying to understand and learning about how does firewall. I want my firewall like if you fail 3 times it will time out. Is there any body could be ...

Suddenly VPN disconnected and can't reconnect no longer on kernel 3.18.1, so I try to install kernel 3.18.2 but my problem still exist. But I can connect to VPN with 3.14 kernel easily.
The output of ...

Setup:
Client server running Ubuntu 14.04 connecting to another Ubuntu Server 14.04 on NFSv4 on a local LAN.
I have the firewall turned on, with routing rules to allow 192.168.42.0/24 (from/to any). ...

I want to use this flash drive only for secure access, to use my banking account and this kinds of stuffs. Which rules should I use?
I'm very newbie on ubuntu, and I need your help. This flash drive ...

Linode has some documentation on allowing its product "longview" to go through the firewall. It offers two commands for iptables:
iptables -I INPUT -s longview.linode.com -j ACCEPT
iptables -I OUTPUT ...

I'm trying to keep deluged on my headless Ubuntu Server 14.04.1 from functioning when the server isn't connected to a VPN (I know many threads exist discussing the best way to accomplish that; I'm not ...

Since I installed Android Studio, I have a new network device: virbr0. My system log files keep telling me ufw rejected an incomming connection (one time per minute) wich is kind of annoying because ...

Total noob to Linux and Ubuntu. Dual Booted Ubuntu 14.04 and Windows 8 in my Dell Studio 1558.
Everything was working fine until I noticed that my torrent speeds are very less. I tried it again with ...

The KVM host is acting as a gateway / firewall for all of the virtual machine's it runs.
It has a /26 public IP space configured on LAN interface em1: 1.1.1.1/26
It has a /30 rfc1918 IP configured on ...

I'm writing a firewall for the Linux kernel and I'm using the proc_dir_entry data structure (which I've found in the tutorial I'm currently reading).
My firewall is conceived as a kernel module but ...